Robert gnehm and jakob sciimid



NITED ROBERT GNEHM AND JAKOB SOHMID, OF BASLE, SWITZERLAND, ASSIGNORS TO THE SOCIETY OF CHEMICAL INDUSTRY, OF SAME PLACE.

BLUE COLORRNG MATTERQ SPECIFICATION forming part of Letters Patent No. 413,049, dated October 15, 1889.

Application filed May 16, 1889. Serial No. 311,041. (Specimens) Patented in France April 18, 1838,1107 190,067.

To aZZ whom, it may concern.-

Be it known that we, ROBERT G-NEHM and J AKOB SCHMID, citizens of Switzerland, residing at Basle, in the Canton of Basle, Switzerland, have invented new and useful Improvements in Blue Coloring-Hatters, (for which Letters Patent have been granted to us in France, bearing date April 18, 1888, No. 190,067,) of which the following is a specifica- IO tion.

This invention is based on the discovery that metaoxydiplieuylamine, which was first described by V. Mei-z and 1V. WVeith, (Bcrichte dcr deutschcn chem z' schen Gesellschaft, XIV,

I" 1881 a e 2 3 when transformed into a J 7 a 7 7,

phenylized derivation of meta-amidophenolphthaleine, produces coloring-matters which have the same relation to the ordinary metaamidophenolphthaleine as the rosaniline blue has to fuchsine.

The blue coloring-matter which forms the subjectqnatter of our present application for a patent is produced by the reaction of dichlorophthalic acid on metaoxydiphenylamine in the presence of chloride of zinc or another condensing agent at a temperature of 170 to 200 centigrade.

In carrying out our invention we can proceed as follows: Seven kilograms of metaoxydiphenylamine, five kilograms of dichlorophthalic acid, and eight kilograms of chloride of zinc are mixed together and heated during five hours at from 170 to 200 centigrade. The molten mass, which is at first semi-fluid, soon becomes solid. The glasslike melt, when cold, is finely pulverized and /OGII3\6NEI G ll 5 0 11,01, Q 7. a

' is diffimflfly Soluble in hot benzine. 5 5

\Vhat we claim as new, and desire to secure by Letters Patent, is-

As a new product, the blue coloring-matter or dye-stutf phenylmeta-amidophenoldichlorphthaleine, which forms a dark indigo-blue 6o powder with a metallic luster, insoluble in water, difficultly soluble in hot benzine, soluble in alcohol with a blue color, and which dyes silk with a strongly fluorescent blue.

In testimony whereof we have hereunto set our hands and seals in the presence of two subscribing Witnesses.

ROBERT GNEIIM. [L. s.] JAKOB SCHMID. [L. s]

Witnesses:

GEORGE Girronn, ED. BRASELMANN. 

